X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FExecutionEngine%2FJITMemoryManager.h;h=a63f0da773a2871ffc91c968fe57bb1916a1a39a;hb=439661395fd2a2a832dba01c65bc88718528313c;hp=e1f2763e1db6447e9860afe742f8fafeba81c1f6;hpb=5913e6c5dbaff88ac00d5e679382abc72323831a;p=oota-llvm.git diff --git a/include/llvm/ExecutionEngine/JITMemoryManager.h b/include/llvm/ExecutionEngine/JITMemoryManager.h index e1f2763e1db..a63f0da773a 100644 --- a/include/llvm/ExecutionEngine/JITMemoryManager.h +++ b/include/llvm/ExecutionEngine/JITMemoryManager.h @@ -6,18 +6,17 @@ // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// -// -// This file defines the JITMemoryManagerInterface -// -//===----------------------------------------------------------------------===// #ifndef LLVM_EXECUTION_ENGINE_JIT_MEMMANAGER_H #define LLVM_EXECUTION_ENGINE_JIT_MEMMANAGER_H #include "llvm/Support/DataTypes.h" +#include namespace llvm { + class Function; + class GlobalValue; /// JITMemoryManager - This interface is used by the JIT to allocate and manage /// memory for the code generated by the JIT. This can be reimplemented by @@ -26,15 +25,28 @@ namespace llvm { class JITMemoryManager { protected: bool HasGOT; - bool SizeRequired; + public: - JITMemoryManager() : HasGOT(false), SizeRequired(false) {} + JITMemoryManager() : HasGOT(false) {} virtual ~JITMemoryManager(); - + /// CreateDefaultMemManager - This is used to create the default /// JIT Memory Manager if the client does not provide one to the JIT. static JITMemoryManager *CreateDefaultMemManager(); - + + /// setMemoryWritable - When code generation is in progress, + /// the code pages may need permissions changed. + virtual void setMemoryWritable() = 0; + + /// setMemoryExecutable - When code generation is done and we're ready to + /// start execution, the code pages may need permissions changed. + virtual void setMemoryExecutable() = 0; + + /// setPoisonMemory - Setting this flag to true makes the memory manager + /// garbage values over freed memory. This is useful for testing and + /// debugging, and may be turned on by default in debug mode. + virtual void setPoisonMemory(bool poison) = 0; + //===--------------------------------------------------------------------===// // Global Offset Table Management //===--------------------------------------------------------------------===// @@ -43,36 +55,32 @@ public: /// method is invoked to allocate it. This method is required to set HasGOT /// to true. virtual void AllocateGOT() = 0; - + /// isManagingGOT - Return true if the AllocateGOT method is called. - /// bool isManagingGOT() const { return HasGOT; } - + /// getGOTBase - If this is managing a Global Offset Table, this method should /// return a pointer to its base. - virtual unsigned char *getGOTBase() const = 0; - - /// NeedsExactSize - If the memory manager requires to know the size of the - /// objects to be emitted - bool NeedsExactSize() const { - return SizeRequired; - } + virtual uint8_t *getGOTBase() const = 0; //===--------------------------------------------------------------------===// // Main Allocation Functions //===--------------------------------------------------------------------===// - - /// startFunctionBody - When we start JITing a function, the JIT calls this + + /// startFunctionBody - When we start JITing a function, the JIT calls this /// method to allocate a block of free RWX memory, which returns a pointer to - /// it. The JIT doesn't know ahead of time how much space it will need to - /// emit the function, so it doesn't pass in the size. Instead, this method - /// is required to pass back a "valid size". The JIT will be careful to not - /// write more than the returned ActualSize bytes of memory. - virtual unsigned char *startFunctionBody(const Function *F, - uintptr_t &ActualSize) = 0; - + /// it. If the JIT wants to request a block of memory of at least a certain + /// size, it passes that value as ActualSize, and this method returns a block + /// with at least that much space. If the JIT doesn't know ahead of time how + /// much space it will need to emit the function, it passes 0 for the + /// ActualSize. In either case, this method is required to pass back the size + /// of the allocated block through ActualSize. The JIT will be careful to + /// not write more than the returned ActualSize bytes of memory. + virtual uint8_t *startFunctionBody(const Function *F, + uintptr_t &ActualSize) = 0; + /// allocateStub - This method is called by the JIT to allocate space for a /// function stub (used to handle limited branch displacements) while it is /// JIT compiling a function. For example, if foo calls bar, and if bar @@ -81,33 +89,89 @@ public: /// thunk for it. The stub should be "close" to the current function body, /// but should not be included in the 'actualsize' returned by /// startFunctionBody. - virtual unsigned char *allocateStub(const GlobalValue* F, unsigned StubSize, - unsigned Alignment) =0; - - + virtual uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize, + unsigned Alignment) = 0; + /// endFunctionBody - This method is called when the JIT is done codegen'ing /// the specified function. At this point we know the size of the JIT /// compiled function. This passes in FunctionStart (which was returned by - /// the startFunctionBody method) and FunctionEnd which is a pointer to the + /// the startFunctionBody method) and FunctionEnd which is a pointer to the /// actual end of the function. This method should mark the space allocated /// and remember where it is in case the client wants to deallocate it. - virtual void endFunctionBody(const Function *F, unsigned char *FunctionStart, - unsigned char *FunctionEnd) = 0; - - /// deallocateMemForFunction - Free JIT memory for the specified function. - /// This is never called when the JIT is currently emitting a function. - virtual void deallocateMemForFunction(const Function *F) = 0; - + virtual void endFunctionBody(const Function *F, uint8_t *FunctionStart, + uint8_t *FunctionEnd) = 0; + + /// allocateSpace - Allocate a memory block of the given size. This method + /// cannot be called between calls to startFunctionBody and endFunctionBody. + virtual uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) = 0; + + /// allocateGlobal - Allocate memory for a global. + virtual uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) = 0; + + /// deallocateFunctionBody - Free the specified function body. The argument + /// must be the return value from a call to startFunctionBody() that hasn't + /// been deallocated yet. This is never called when the JIT is currently + /// emitting a function. + virtual void deallocateFunctionBody(void *Body) = 0; + /// startExceptionTable - When we finished JITing the function, if exception /// handling is set, we emit the exception table. - virtual unsigned char* startExceptionTable(const Function* F, - uintptr_t &ActualSize) = 0; - + virtual uint8_t* startExceptionTable(const Function* F, + uintptr_t &ActualSize) = 0; + /// endExceptionTable - This method is called when the JIT is done emitting /// the exception table. - virtual void endExceptionTable(const Function *F, unsigned char *TableStart, - unsigned char *TableEnd, - unsigned char* FrameRegister) = 0; + virtual void endExceptionTable(const Function *F, uint8_t *TableStart, + uint8_t *TableEnd, uint8_t* FrameRegister) = 0; + + /// deallocateExceptionTable - Free the specified exception table's memory. + /// The argument must be the return value from a call to startExceptionTable() + /// that hasn't been deallocated yet. This is never called when the JIT is + /// currently emitting an exception table. + virtual void deallocateExceptionTable(void *ET) = 0; + + /// CheckInvariants - For testing only. Return true if all internal + /// invariants are preserved, or return false and set ErrorStr to a helpful + /// error message. + virtual bool CheckInvariants(std::string &) { + return true; + } + + /// GetDefaultCodeSlabSize - For testing only. Returns DefaultCodeSlabSize + /// from DefaultJITMemoryManager. + virtual size_t GetDefaultCodeSlabSize() { + return 0; + } + + /// GetDefaultDataSlabSize - For testing only. Returns DefaultCodeSlabSize + /// from DefaultJITMemoryManager. + virtual size_t GetDefaultDataSlabSize() { + return 0; + } + + /// GetDefaultStubSlabSize - For testing only. Returns DefaultCodeSlabSize + /// from DefaultJITMemoryManager. + virtual size_t GetDefaultStubSlabSize() { + return 0; + } + + /// GetNumCodeSlabs - For testing only. Returns the number of MemoryBlocks + /// allocated for code. + virtual unsigned GetNumCodeSlabs() { + return 0; + } + + /// GetNumDataSlabs - For testing only. Returns the number of MemoryBlocks + /// allocated for data. + virtual unsigned GetNumDataSlabs() { + return 0; + } + + /// GetNumStubSlabs - For testing only. Returns the number of MemoryBlocks + /// allocated for function stubs. + virtual unsigned GetNumStubSlabs() { + return 0; + } }; } // end namespace llvm.